package com.panan.GenTool;


import com.panan.Config;

import java.io.*;
import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class GenEntity {

    private static String packageOutPath = Config.map.get("entity.calss.output.package");
    private static String authorName = Config.map.get("entity.annotation.author");
    //数据库连接
    private static String URL = Config.map.get("database.location");
    private static String NAME = Config.map.get("database.user.account");
    private static String PASS = Config.map.get("database.user.password");
    private static String DRIVER = Config.map.get("database.driver");

    private String tablename = Config.map.get("database.table");//表名
    private String[] colnames; // 列名数组
    private String[] colTypes; //列名类型数组
    private int[] colSizes; //列名大小数组
    private boolean f_util = false; // 是否需要导入包java.util.*
    private boolean f_sql = false; // 是否需要导入包java.sql.*

    /*
     * 构造函数
     */
    public GenEntity(){
        //创建连接
        Connection con;
        //查要生成实体类的表
        String sql = "select * from " + tablename;
        List<String> list = new ArrayList<String>();
        PreparedStatement pStemt = null;
        try {
            try {
                Class.forName(DRIVER);
            } catch (ClassNotFoundException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            con = DriverManager.getConnection(URL,NAME,PASS);
            pStemt = con.prepareStatement(sql);
            ResultSetMetaData rsmd = pStemt.getMetaData();
            int size = rsmd.getColumnCount();   //统计列
            colnames = new String[size];
            colTypes = new String[size];
            colSizes = new int[size];
            for (int i = 0; i < size; i++) {
                colnames[i] = rsmd.getColumnName(i + 1);
                list.add(colnames[i]);
                colTypes[i] = rsmd.getColumnTypeName(i + 1);

                if(colTypes[i].equalsIgnoreCase("datetime")){
                    f_util = true;
                }
                if(colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text")){
                    f_sql = true;
                }
                colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
            }
            Config.colMap.put("entity.column",list);
            String content = parse(colnames,colTypes,colSizes);

            try {
                File directory = new File("");
                String path=this.getClass().getResource("").getPath();
                String outputPath = directory.getAbsolutePath()+ "/src/main/java/"+this.packageOutPath.replace(".", "/")+"/"+initcap(handleFiled(tablename,0)) + ".java";
                FileWriter fw = new FileWriter(outputPath);
                PrintWriter pw = new PrintWriter(fw);
                pw.println(content);
                pw.flush();
                pw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally{

        }
    }

    /**
     * 功能：生成实体类主体代码
     * @param colnames
     * @param colTypes
     * @param colSizes
     * @return
     */
    private String parse(String[] colnames, String[] colTypes, int[] colSizes) {
        StringBuffer sb = new StringBuffer();
        sb.append("package " + this.packageOutPath + ";\r\n");
        //判断是否导入工具包
        if(f_util){
            sb.append("import java.util.Date;\r\n");
        }
        if(f_sql){
            sb.append("import java.sql.*;\r\n");
        }

        sb.append("\r\n");
        //注释部分
        sb.append("/**\r\n");
        sb.append(" * "+tablename+" 实体类\r\n");
        sb.append(" * @version 1.0.0"+"\r\n");
        sb.append(" * @author "+this.authorName+"\r\n");
        sb.append(" * @since "+new Date()+"\r\n");
        sb.append(" */ \r\n");
        //实体部分
        sb.append("\r\npublic class " + initcap(handleFiled(tablename,0)) + "{\r\n\n");
        Config.map.put("entity.mapper.name",handleFiled(tablename,0)+"Mapper");
        Config.map.put("entity.name",handleFiled(tablename,0));
        processAllAttrs(sb);//属性
        processAllMethod(sb);//get set方法
        sb.append("}\r\n");

        //System.out.println(sb.toString());
        return sb.toString();
    }

    /**
     * 功能：生成所有属性
     * @param sb
     */
    private void processAllAttrs(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {
            String field = colnames[i];
            sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + handleFiled(field,1) + ";\r\n\n");
        }

    }
    /**
     * 功能：替换掉数据库中字段名_,并以接下来的首字母大写
     * */
    private String handleFiled(String field,int location){

        if(field.contains("_")){
            StringBuilder returnStr = new StringBuilder();
            String[] strs = field.split("_");
            for (int i = location;i<strs.length;i++){
                strs[i] = strs[i].substring(0,1).toUpperCase()+strs[i].substring(1);
            }
            for (String string: strs) {
                returnStr.append(string);
            }
            return returnStr.toString();
        }
        return field;
    }

    /**
     * 功能：生成所有方法
     * @param sb
     */
    private void processAllMethod(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {
            String field = handleFiled(colnames[i],1);
            sb.append("\tpublic void set" + initcap(field) + "(" + sqlType2JavaType(colTypes[i]) + " " +
                    field + "){\r\n");
            sb.append("\tthis." + field + "=" + field + ";\r\n");
            sb.append("\t}\r\n\n");
            sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + initcap(field) + "(){\r\n");
            sb.append("\t\treturn " + field + ";\r\n");
            sb.append("\t}\r\n\n");
        }

    }

    /**
     * 功能：将输入字符串的首字母改成大写
     * @param str
     * @return
     */
    private String initcap(String str) {

        char[] ch = str.toCharArray();
        if(ch[0] >= 'a' && ch[0] <= 'z'){
            ch[0] = (char)(ch[0] - 32);
        }

        return new String(ch);
    }

    /**
     * 功能：获得列的数据类型
     * @param sqlType
     * @return
     */
    private String sqlType2JavaType(String sqlType) {

        if(sqlType.equalsIgnoreCase("bit")){
            return "boolean";
        }else if(sqlType.equalsIgnoreCase("tinyint")){
            return "byte";
        }else if(sqlType.equalsIgnoreCase("smallint")){
            return "short";
        }else if(sqlType.equalsIgnoreCase("int")||sqlType.trim().equalsIgnoreCase("int unsigned")){
            return "int";
        }else if(sqlType.equalsIgnoreCase("bigint")){
            return "long";
        }else if(sqlType.equalsIgnoreCase("float")){
            return "float";
        }else if(sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
                || sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
                || sqlType.equalsIgnoreCase("smallmoney")||sqlType.equalsIgnoreCase("double")){
            return "double";
        }else if(sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
                || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
                || sqlType.equalsIgnoreCase("text")){
            return "String";
        }else if(sqlType.equalsIgnoreCase("datetime")){
            return "Date";
        }else if(sqlType.equalsIgnoreCase("image")){
            return "Blod";
        }

        return null;
    }

}
